How can I correctly read and save a bcrf file in Python using utf-16 encoding?

I tried to read a *.bcrf file generated by SPIP tool and intended to save it back to a *.bcrf file as exactly same content as the original. But the results seems not going well. Here is the link description of the bcrf file format: http://www.imagemet.com/WebHelp6/Default.htm#Reference_Guide/BCR_STM_File_Format.htm The bcrf file I tried to read: bcrf file

import struct

def read_bcrf_file(filename):
    header_size = 2048
    data_size = 900 * 900 * 4  # Assuming 32-bit floating point data (bcrf format)

    with open(filename, 'rb') as file:
        # Read the header
        header = file.read(header_size)

        # Parse the header values
        header_dict = {}
        decoded_header = header.decode('utf-16').replace('\x00', '')
        for line in decoded_header.split('\n'):
            if '=' in line:
                key, value = line.strip().split('=')
                header_dict[key.strip()] = value.strip()

        # Read the data
        data = file.read(data_size)

    return header_dict, data


def convert_data_to_float(data):
    float_data = struct.unpack('<' + 'f' * (len(data) // 4), data)
    return float_data


def write_bcr_file(filename, header_dict, data):
    header_size = 2048

    # Create the header string
    header = ""
    for key, value in header_dict.items():
        header += key + " = " + value + "\n"

    # Pad the header to the required size
    header = header.ljust(header_size, '\x00')

    with open(filename, 'wb') as file:
        # Write the header
        file.write(header.encode('utf-16')[2:])

        # Write the data
        data_bytes = struct.pack('<' + 'f' * len(data), *data)
        file.write(data_bytes)


# Example usage
header, binary_data = read_bcrf_file('test_file.bcrf')
data = convert_data_to_float(binary_data)
write_bcr_file('new.bcrf', header_dict=header, data=data)
# Process the data as needed

The new image is dislocation

header = header.ljust(header_size, '\x00') this line is wrong， try my code

import struct

def read_bcrf_file(filename):
    header_size = 4096
    data_size = 900 * 900 * 4  # Assuming 32-bit floating point data (bcrf format)

    with open(filename, 'rb') as file:
        # Read the header
        header = file.read(header_size)

        # Parse the header values
        header_dict = {}
        decoded_header = header.decode('utf-16le')
        for line in decoded_header.split('\n'):
            if '=' in line:
                key, value = line.strip().split('=')
                header_dict[key.strip()] = value.strip()

        # Read the data
        data = file.read(data_size)
    return header_dict, data


def convert_data_to_float(data):
    float_data = struct.unpack('<' + 'f' * (len(data) // 4), data)
    # print(float_data[:10])
    return float_data


def write_bcr_file(filename, header_dict, data):
    header_size = 4096

    # Create the header string
    header = ""
    for key, value in header_dict.items():
        header += key + " = " + value + "\n"

    # Pad the header to the required size
    header = header.ljust(header_size//2, '%')

    with open(filename, 'wb') as file:
        # Write the header
        file.write(header.encode('utf-16le'))

        # Write the data
        data_bytes = struct.pack('<' + 'f' * len(data), *data)
        file.write(data_bytes)


# Example usage
header, binary_data = read_bcrf_file('test_file.bcrf')
data = convert_data_to_float(binary_data)
write_bcr_file('new.bcrf', header_dict=header, data=data)
# Process the data as needed